package com.blb.utils;

import javax.mail.*;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import java.util.Properties;

public class EmailUtil {
    // 随机验证码
    public String achieveCode() {
        String[] beforeShuffle = new String[]{"0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "A", "B", "C", "D", "E", "F",
                "G", "H", "I", "J", "K", "L", "M", "N", "O", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z", "a",
                "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m", "n", "o", "p", "q", "r", "s", "t", "u", "v",
                "w", "x", "y", "z"};
        List list = Arrays.asList(beforeShuffle);//将数组转换为集合
        Collections.shuffle(list);  //打乱集合顺序
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < list.size(); i++) {
            sb.append(list.get(i)); //将集合转化为字符串
        }
        return sb.toString().substring(3, 8);  //截取字符串第4到8
    }

    /**
     * 发送邮件
     *
     * @param to   给谁发
     * @param text 发送内容
     */
    public static void send_mail(String to, String text) throws Exception {
        //创建连接对象 连接到邮件服务器
        Properties properties = new Properties();
        //设置发送邮件的基本参数
        //发送邮件服务器
        properties.put("mail.smtp.host", "smtp.qq.com");
        //发送端口
        properties.put("mail.smtp.port", "25");
        properties.put("mail.smtp.auth", "true");
        //设置发送邮件的账号和密码
        Session session = Session.getInstance(properties, new Authenticator() {
            @Override
            protected PasswordAuthentication getPasswordAuthentication() {
                //两个参数分别是发送邮件的账户和密码
                return new PasswordAuthentication("1942739745@qq.com", "xjtfscywsewbbbge");
            }
        });
        //创建邮件对象
        Message message = new MimeMessage(session);
        //设置发件人
        message.setFrom(new InternetAddress("1942739745@qq.com"));
        //设置收件人
        message.setRecipient(Message.RecipientType.TO, new InternetAddress(to));
        //设置主题
        message.setSubject("验证码");
        //设置邮件正文  第二个参数是邮件发送的类型
        message.setContent(text, "text/html;charset=UTF-8");
        //发送一封邮件
        Transport.send(message);
    }
}